Kit ◆
ConvertKit (now Kit) is an email-first platform that automates email marketing, newsletter growth, and digital product sales for creators.

Mailbutler (Marketing & SEO): Mailbutler adds email tracking, mail merge, shared inbox collaboration, and signature marketing on top of your existing email client. Pricing: from $0 (Starter) or $5/user/mo. (data verified July 2026)
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Mailbutler is a productivity extension for Gmail, Apple Mail, and Outlook that supercharges your inbox without switching platforms. It solves the problem of tracking email engagement, sending personalized bulk emails, collaborating on a shared inbox, and adding marketing banners to signatures — all from your existing email client.
Mailbutler is ideal for sales professionals, freelancers, small teams, and customer-facing roles who need to know when emails are opened, send mass personalized messages, or manage inbox tasks together. It is not a standalone email client; it works as a plug-in on top of your current email provider.
Use Mailbutler's email tracking to see exactly when a prospect opens your proposal. Send a mail merge for a newsletter or event invitation, scheduling each email to arrive at the recipient's best time. Collaborate with teammates using live status icons and email assignments right inside Gmail or Outlook. Build branded email signatures with CTAs and social links, then share templates with your whole team.
Editorial score from our review methodology — not user ratings.
Mailbutler pricing: from $0 (Starter) or $5/user/mo.
$0 per user per month. Includes basic email tracking, pre-defined signatures, and custom signatures. Emails include a visible Mailbutler watermark. Free forever after the 14-day trial.
$5 per user per month (billed monthly, $4 per user per month billed yearly). Adds real-time notifications, mail merge (tailored sending), inbox collaboration features, and signature marketing with branded CTAs and social links. Yearly billing saves 25%.
All plans start with a 14-day free trial with full features — no credit card required.
Don’t take our word for it — ask your AI about Mailbutler